Optical imaging lens set and electronic device comprising the same

ABSTRACT

An optical imaging lens set includes: a first lens element with positive refractive power, a second lens element having an image-side surface with a concave portion in a vicinity of its periphery, a third lens element with positive refractive power, having a convex image-side surface, an object-side surface with a concave portion in a vicinity of its periphery, a fourth lens element having a concave object-side surface, and a plastic fifth lens element having an image-side surface with a concave portion in a vicinity of the optical axis. The total thickness T a1  of the all lens elements along the optical axis, all four air gaps Gaa between each lens element along the optical axis, the thickness T 3  of the third lens element along the optical axis and the thickness T 5  of the fifth lens element along the optical axis satisfy the relation (T a1 +G aa )/(T 3 +T 5 )≦4.00.

CROSS REFERENCE TO RELATED APPLICATION

This application claims priority to China Application No.201310127575.5, filed on Apr. 12, 2013.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention generally relates to an optical imaging lens setand an electronic device which includes such optical imaging lens set.Specifically speaking, the present invention is directed to an opticalimaging lens set of five lens elements and an electronic device whichincludes such optical imaging lens set of five lens elements.

2. Description of the Prior Art

In recent years, the popularity of mobile phones and digital camerasmakes the photography modules of various portable electronic products,such as optical imaging lens elements or an image sensor . . . developquickly, and the shrinkage of mobile phones and digital cameras alsomakes a greater and greater demand for the miniaturization of thephotography module. The current trend of research is to develop anoptical imaging lens set of a shorter length with uncompromised goodquality.

With the development and shrinkage of a charge coupled device (CCD) or acomplementary metal oxide semiconductor element (CMOS), the opticalimaging lens set installed in the photography module shrinks to meet thedemands as well. However, good and necessary optical properties, such asthe system aberration improvement, as well as production cost andproduction feasibility should be taken into consideration, too.

For example, US 2012/0087019 and US 2010/0254029 disclose an opticalimaging lens set made of five lens elements. However, the fifth lenselement has a greater thickness. And, the distance form the object-sideof the first lens element to the image plane is longer than 9 mm.

Further, JP 4858648 and JP 2007-298572 disclose another optical imaginglens set made of five lens elements. The distance form the object-sideof the first lens element to the image plane is longer than 6.0 mm.

These disclosed dimensions do not show good examples of the shrinkage ofportable electronic products, such as mobile phones and digital cameras.It is still a problem, on one hand, to reduce the system lengthefficiently and, on the other hand, to maintain a sufficient opticalperformance in this field.

SUMMARY OF THE INVENTION

In the light of the above, the present invention is capable of proposingan optical imaging lens set of lightweight, low production cost, reducedlength, high resolution and high image quality. The optical imaging lensset of five lens elements of the present invention has an aperture stop,a first lens element, a second lens element, a third lens element, afourth lens element and a fifth lens element sequentially from an objectside to an image side along an optical axis.

The first lens element has positive refractive power. The second lenselement has a second image-side surface facing toward the image side andthe second image-side surface has a concave portion in a vicinity of acircular periphery of the second lens element. The third lens elementhas positive refractive power, a third image-side surface facing towardthe image side and a third object-side surface facing toward the objectside. The third image-side surface is a convex surface and the thirdobject-side surface has a concave portion in a vicinity of a circularperiphery of the third lens element. The fourth lens element has afourth object-side surface facing toward the object side and the fourthobject-side surface is a concave surface. The fifth lens element is madeof plastic, has a fifth image-side surface facing toward the image sideand the fifth image-side surface has a concave portion in a vicinity ofthe optical axis. The optical imaging lens set exclusively has five lenselements with refractive power.

In the optical imaging lens set of five lens elements of the presentinvention, the first lens element has a first lens element thickness T₁,the second lens element has a second lens element thickness T₂, thethird lens element has a third lens element thickness T₃, the fourthlens element has a fourth lens element thickness T₄, and the fifth lenselement has a fifth lens element thickness T₅, the total thickness ofall the lens elements in the optical imaging lens set along the opticalaxis is T_(a1)=T₁+T₂+T₃+T₄+T₅.

In the optical imaging lens set of five lens elements of the presentinvention, an air gap G₁₂ is disposed between the first lens element andthe second lens element, an air gap G₂₃ is disposed between the secondlens element and the third lens element, an air gap G₃₄ is disposedbetween the third lens element and the fourth lens element, an air gapG₄₅ is disposed between the fourth lens element and the fifth lenselement, the total four air gaps between adjacent lens elements from thefirst lens element to the fifth lens element along the optical axis isG_(aa)=G₁₂+G₂₃+G₃₄+G₄₅.

In the optical imaging lens set of five lens elements of the presentinvention, it is (T_(a1)+G_(aa))/(T₃+T₅)≦4.00.

In the optical imaging lens set of five lens elements of the presentinvention, it is T_(a1)/T₃≦5.80.

In the optical imaging lens set of five lens elements of the presentinvention, it is 5.60≦(T₁+T₃+T₅)/(T₂).

In the optical imaging lens set of five lens elements of the presentinvention, it is 2.45≦(T₃+T₅)/(T₄).

In the optical imaging lens set of five lens elements of the presentinvention, it is 8.70≦(T_(a1)+G_(aa))/(T₂+G₄₅).

In the optical imaging lens set of five lens elements of the presentinvention, it is 1.20≦(G₂₃)/(G₃₄+G₄₅).

In the optical imaging lens set of five lens elements of the presentinvention, it is 5.00≦(T_(a1)+G_(aa))/(T₂+T₄).

In the optical imaging lens set of five lens elements of the presentinvention, it is 3.30≦(G₂₃+G₃₄)/(G₁₂+G₄₅).

In the optical imaging lens set of five lens elements of the presentinvention, it is 2.60≦(T₁+T₅)/(T₄).

In the optical imaging lens set of five lens elements of the presentinvention, it is 1.30≦(T₂)/(G₁₂+G₄₅).

In the optical imaging lens set of five lens elements of the presentinvention, it is 2.00≦T₃/T₂.

In the optical imaging lens set of five lens elements of the presentinvention, it is 4.30≦(T₁+T₃)/T₂.

In the optical imaging lens set of five lens elements of the presentinvention, it is 3.80≦(T₁+T₃+T₅)/T₄ and the first lens element furtherhas a first image-side surface facing toward the image side and thefirst image-side surface has a concave part in a vicinity of the opticalaxis.

In the optical imaging lens set of five lens elements of the presentinvention, it is 2.30≦(G₂₃)/(G₁₂+G₄₅).

The present invention also proposes an electronic device which includesthe optical imaging lens set as described above. The electronic deviceincludes a case and an image module disposed in the case. The imagemodule includes an optical imaging lens set as described above, a barrelfor the installation of the optical imaging lens set, a module housingunit for the installation of the barrel, and an image sensor disposed atan image side of the optical imaging lens set.

In the electronic device of the present invention, the module housingunit has a lens element housing. The lens element housing has a firstseat element and a second seat element. The first seat element isexteriorly attached to the barrel and disposed along an axis. The secondseat element is disposed along the axis and exteriorly surrounds thefirst seat element so that the first seat element, the barrel, and theoptical imaging lens set are capable of moving together to control theoptical imaging lens set along the optical axis.

In the electronic device of the present invention, the module housingunit has a lens element housing. The lens element housing has a firstseat element exteriorly attached to the barrel and disposed along anaxis as well as a second seat element disposed along the axis andexteriorly surrounding the first seat element. The first seat element,the barrel, and the optical imaging lens set are capable of movingtogether to control the optical imaging lens set along the optical axis.

In the electronic device of the present invention, the module housingunit includes an image sensor housing disposed between the lens elementhousing and the image sensor and the image sensor housing is attached tothe second seat element.

These and other objectives of the present invention will no doubt becomeobvious to those of ordinary skill in the art after reading thefollowing detailed description of the preferred embodiment that isillustrated in the various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a first example of the optical imaging lens set ofthe present invention.

FIG. 2A illustrates the longitudinal spherical aberration on the imageplane of the first example.

FIG. 2B illustrates the astigmatic aberration on the sagittal directionof the first example.

FIG. 2C illustrates the astigmatic aberration on the tangentialdirection of the first example.

FIG. 2D illustrates the distortion aberration of the first example.

FIG. 3 illustrates a second example of the optical imaging lens set offive lens elements of the present invention.

FIG. 4A illustrates the longitudinal spherical aberration on the imageplane of the second example.

FIG. 4B illustrates the astigmatic aberration on the sagittal directionof the second example.

FIG. 4C illustrates the astigmatic aberration on the tangentialdirection of the second example.

FIG. 4D illustrates the distortion aberration of the second example.

FIG. 5 illustrates a third example of the optical imaging lens set offive lens elements of the present invention.

FIG. 6A illustrates the longitudinal spherical aberration on the imageplane of the third example.

FIG. 6B illustrates the astigmatic aberration on the sagittal directionof the third example.

FIG. 6C illustrates the astigmatic aberration on the tangentialdirection of the third example.

FIG. 6D illustrates the distortion aberration of the third example.

FIG. 7 illustrates a fourth example of the optical imaging lens set offive lens elements of the present invention.

FIG. 8A illustrates the longitudinal spherical aberration on the imageplane of the fourth example.

FIG. 8B illustrates the astigmatic aberration on the sagittal directionof the fourth example.

FIG. 8C illustrates the astigmatic aberration on the tangentialdirection of the fourth example.

FIG. 8D illustrates the distortion aberration of the fourth example.

FIG. 9 illustrates a fifth example of the optical imaging lens set offive lens elements of the present invention.

FIG. 10A illustrates the longitudinal spherical aberration on the imageplane of the fifth example.

FIG. 10B illustrates the astigmatic aberration on the sagittal directionof the fifth example.

FIG. 10C illustrates the astigmatic aberration on the tangentialdirection of the fifth example.

FIG. 10D illustrates the distortion aberration of the fifth example.

FIG. 11 illustrates a sixth example of the optical imaging lens set offive lens elements of the present invention.

FIG. 12A illustrates the longitudinal spherical aberration on the imageplane of the sixth example.

FIG. 12B illustrates the astigmatic aberration on the sagittal directionof the sixth example.

FIG. 12C illustrates the astigmatic aberration on the tangentialdirection of the sixth example.

FIG. 12D illustrates the distortion aberration of the sixth example.

FIG. 13 illustrates a seventh example of the optical imaging lens set offive lens elements of the present invention.

FIG. 14A illustrates the longitudinal spherical aberration on the imageplane of the seventh example.

FIG. 14B illustrates the astigmatic aberration on the sagittal directionof the seventh example.

FIG. 14C illustrates the astigmatic aberration on the tangentialdirection of the seventh example.

FIG. 14D illustrates the distortion aberration of the seventh example.

FIG. 15 illustrates exemplificative shapes of the optical imaging lenselement of the present invention.

FIG. 16 illustrates a first preferred example of the portable electronicdevice with an optical imaging lens set of the present invention.

FIG. 17 illustrates a second preferred example of the portableelectronic device with an optical imaging lens set of the presentinvention.

FIG. 18 shows the optical data of the first example of the opticalimaging lens set.

FIG. 19 shows the aspheric surface data of the first example.

FIG. 20 shows the optical data of the second example of the opticalimaging lens set.

FIG. 21 shows the aspheric surface data of the second example.

FIG. 22 shows the optical data of the third example of the opticalimaging lens set.

FIG. 23 shows the aspheric surface data of the third example.

FIG. 24 shows the optical data of the fourth example of the opticalimaging lens set.

FIG. 25 shows the aspheric surface data of the fourth example.

FIG. 26 shows the optical data of the fifth example of the opticalimaging lens set.

FIG. 27 shows the aspheric surface data of the fifth example.

FIG. 28 shows the optical data of the sixth example of the opticalimaging lens set.

FIG. 29 shows the aspheric surface data of the sixth example.

FIG. 30 shows the optical data of the seventh example of the opticalimaging lens set.

FIG. 31 shows the aspheric surface data of the seventh example.

FIG. 32 shows some important ratios in the examples.

DETAILED DESCRIPTION

Before the detailed description of the present invention, the firstthing to be noticed is that in the present invention, similar (notnecessarily identical) elements share the same numeral references. Inthe entire present specification, “a certain lens element hasnegative/positive refractive power” refers to the part in a vicinity ofthe optical axis of the lens element has negative/positive refractivepower. “An object-side/image-side surface of a certain lens element hasa concave/convex part” refers to the part is more concave/convex in adirection parallel with the optical axis to be compared with an outerregion next to the region. Taken FIG. 15 for example, the optical axisis “I” and the lens element is symmetrical with respect to the opticalaxis I. The object side of the lens element has a convex part in theregion A, a concave part in the region B, and a convex part in theregion C because region A is more convex in a direction parallel withthe optical axis than an outer region (region B) next to region A,region B is more concave than region C and region C is similarly moreconvex than region E. “A circular periphery of a certain lens element”refers to a circular periphery region of a surface on the lens elementfor light to pass through, that is, region C in the drawing. In thedrawing, imaging light includes Lc (chief ray) and Lm (marginal ray). “Avicinity of the optical axis” refers to an optical axis region of asurface on the lens element for light to pass through, that is, theregion A in FIG. 15. In addition, the lens element may include anextension part E for the lens element to be installed in an opticalimaging lens set. Ideally speaking, no light would pass through theextension part, and the actual structure and shape of the extension partis not limited to this and may have other variations. For the reason ofsimplicity, the extension part is not illustrated in FIGS. 1, 3, 5, 7,9, 11 and 13.

As shown in FIG. 1, the optical imaging lens set 1 of five lens elementsof the present invention, sequentially from an object side 2 (where anobject is located) to an image side 3 along an optical axis 4, has afirst lens element 10, a second lens element 20, a third lens element30, a fourth lens element 40, a fifth lens element 50, a filter 60 andan image plane 71. Generally speaking, the first lens element 10, thesecond lens element 20, the third lens element 30, the fourth lenselement 40 and the fifth lens element 50 may be made of a transparentplastic material and each has an appropriate refractive power, but thepresent invention is not limited to this. There are exclusively fivelens elements with refractive power in the optical imaging lens set 1 ofthe present invention. The optical axis 4 is the optical axis of theentire optical imaging lens set 1, and the optical axis of each of thelens elements coincides with the optical axis of the optical imaginglens set 1.

Furthermore, the optical imaging lens set 1 includes an aperture stop(ape. stop) 80 disposed in an appropriate position. In FIG. 1, theaperture stop 80 is disposed in front of the first lens element 10. Whenlight emitted or reflected by an object (not shown) which is located atthe object side 2 enters the optical imaging lens set 1 of the presentinvention, it forms a clear and sharp image on the image plane 71 at theimage side 3 after passing through the aperture stop 80, the first lenselement 10, the second lens element 20, the third lens element 30, thefourth lens element 40, the fifth lens element 50 and the filter 60.

In the embodiments of the present invention, the optional filter 60 maybe a filter of various suitable functions, for example, the filter 60may be an infrared cut filter (IR cut filter), placed between the fifthlens element 50 and the image plane 71. The filter 60 is made of glass,without affecting the focal length of the optical lens element system,namely the optical imaging lens set, of the present invention.

Each lens element in the optical imaging lens set 1 of the presentinvention has an object-side surface facing toward the object side 2 aswell as an image-side surface facing toward the image side 3. Inaddition, each object-side surface and image-side surface in the opticalimaging lens set 1 of the present invention has a part in a vicinity ofits circular periphery (circular periphery part) away from the opticalaxis 4 as well as a part in a vicinity of the optical axis (optical axispart) close to the optical axis 4. For example, the first lens element10 has a first object-side surface 11 and a first image-side surface 12;the second lens element 20 has a second object-side surface 21 and asecond image-side surface 22; the third lens element 30 has a thirdobject-side surface 31 and a third image-side surface 32; the fourthlens element 40 has a fourth object-side surface 41 and a fourthimage-side surface 42; the fifth lens element 50 has a fifth object-sidesurface 51 and a fifth image-side surface 52.

Each lens element in the optical imaging lens set 1 of the presentinvention further has a central thickness T on the optical axis 4. Forexample, the first lens element 10 has a first lens element thicknessT₁, the second lens element 20 has a second lens element thickness T₂,the third lens element 30 has a third lens element thickness T₃, thefourth lens element 40 has a fourth lens element thickness T₄, and thefifth lens element 50 has a fifth lens element thickness T₅. Therefore,the total thickness of all the lens elements in the optical imaging lensset 1 along the optical axis 4 is T_(a1)=T₁+T₂+T₃+T₄+T₅.

In addition, between two adjacent lens elements in the optical imaginglens set 1 of the present invention there is an air gap G along theoptical axis 4. For example, an air gap G₁₂ is disposed between thefirst lens element 10 and the second lens element 20, an air gap G₂₃ isdisposed between the second lens element 20 and the third lens element30, an air gap G₃₄ is disposed between the third lens element 30 and thefourth lens element 40, an air gap G₄₅ is disposed between the fourthlens element 40 and the fifth lens element 50. Therefore, the total fourair gaps between adjacent lens elements from the first lens element 10to the fifth lens element 50 along the optical axis 4 isG_(aa)=G₁₂+G₂₃+G₃₄+G₄₅.

FIRST EXAMPLE

Please refer to FIG. 1 which illustrates the first example of theoptical imaging lens set 1 of the present invention. Please refer toFIG. 2A for the longitudinal spherical aberration on the image plane 71of the first example; please refer to FIG. 2B for the astigmatic fieldaberration on the sagittal direction; please refer to FIG. 2C for theastigmatic field aberration on the tangential direction, and pleaserefer to FIG. 2D for the distortion aberration. The Y axis of thespherical aberration in each example is “field of view” for 1.0. The Yaxis of the astigmatic field and the distortion in each example standfor “image height”. The image height is 3.085 mm.

The optical imaging lens set 1 of the first example has five lenselements 10 to 50, each is made of a plastic material and has refractivepower. The optical imaging lens set 1 also has an aperture stop 80, afilter 60, and an image plane 71. The aperture stop 80 is provided infront of the first lens element 10, i.e. at the object side 2 of thefirst lens element 10. The filter 60 may be an infrared filter (IR cutfilter) to prevent inevitable infrared in light reaching the image planeto adversely affect the imaging quality.

The first lens element 10 has positive refractive power. The firstobject-side surface 11 facing toward the object side 2 is a convexsurface and the first image-side surface 12 facing toward the image side3 has a concave part 16 (concave optical axis part) in the vicinity ofthe optical axis and a convex part 17 (convex circular periphery part)in a vicinity of its circular periphery. Both the first object-sidesurface 11 and the first image-side 12 of the first lens element 10 areaspherical surfaces.

The second lens element 20 has negative refractive power. The secondobject-side surface 21 facing toward the object side 2 has a convex part23 (convex optical axis part) in the vicinity of the optical axis and aconcave part 24 (concave circular periphery part) in a vicinity of itscircular periphery. The second image-side surface 22 facing toward theimage side 3 is a concave surface and has a concave part 27 (concavecircular periphery part) in a vicinity of its circular periphery. Inaddition, both the second object-side surface 21 and the secondimage-side surface 22 of the second lens element 20 are asphericalsurfaces.

The third lens element 30 has positive refractive power, a thirdobject-side surface 31 facing toward the object side 2 and a thirdimage-side surface 32 facing toward the image side 3. The thirdobject-side surface 31 has a convex part 33 (convex optical axis part)in the vicinity of the optical axis and a concave part 34 (concavecircular periphery part) in a vicinity of its circular periphery. Thethird image-side surface 32 is a convex surface. In addition, both thethird object-side surface 31 and the third image-side surface 32 of thethird lens element 30 are aspherical surfaces.

The fourth lens element 40 has positive refractive power. The fourthobject-side surface 41 facing toward the object side 2 is a concavesurface and the fourth image-side surface 42 facing toward the imageside 3 is a convex surface. Both the fourth object-side surface 41 andthe fourth image-side 42 of the fourth lens element 40 are asphericalsurfaces.

The fifth lens element 50 has negative refractive power, a fifthobject-side surface 51 facing toward the object side 2 and a fifthimage-side surface 52 facing toward the image side 3. The fifthobject-side surface 51 has a convex part 53 (convex optical axis part)in the vicinity of the optical axis and a convex part 54 (convexcircular periphery part) in a vicinity of its circular periphery as wellas a concave part 55 between the optical axis and the circularperiphery. The fifth image-side surface 52 has a concave part 56(concave optical axis part) in the vicinity of the optical axis and aconvex part 57 (convex circular periphery part) in a vicinity of itscircular periphery. Further, both the fifth object-side surface 51 andthe fifth image-side 52 of the fifth lens element 50 are asphericalsurfaces. The filter 60 may be an infrared cut filter, and is disposedbetween the fifth lens element 50 and the image plane 71.

In the optical imaging lens element 1 of the present invention, theobject side 11/21/31/41/51 and image side 12/22/32/42/52 from the firstlens element 10 to the fifth lens element 50, total of ten surfaces areall aspherical. These aspheric coefficients are defined according to thefollowing formula:

${Z(Y)} = {{\frac{Y^{2}}{R}/\left( {1 + \sqrt{1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}}} \right)} + {\sum\limits_{i = 1}^{n}{a_{2i} \times Y^{2i}}}}$

In which:

R represents the curvature radius of the lens element surface;

Z represents the depth of an aspherical surface (the perpendiculardistance between the point of the aspherical surface at a distance Yfrom the optical axis and the tangent plane of the vertex on the opticalaxis of the aspherical surface);

Y represents a vertical distance from a point on the aspherical surfaceto the optical axis;

K is a conic constant;

a_(2i) is the aspheric coefficient of the 2i order.

The optical data of the first example of the optical imaging lens set 1are shown in FIG. 18 while the aspheric surface data are shown in FIG.19. In the following examples of the optical imaging lens set, thef-number of the entire optical lens element system is Fno, HFOV standsfor the half field of view which is half of the field of view of theentire optical lens element system, and the unit for the curvatureradius, the thickness and the focal length is in millimeters (mm). Thelength of the optical imaging lens set is 5.15 mm. The image height is3.085 mm. Some important ratios of the first example are as follows:(T _(a1) +G _(aa))/(T ₃ +T ₅)=2.75T _(a1) /T ₃=5.80(T ₁ +T ₃ +T ₅)/(T ₂)=8.85(T ₃ +T ₅)/(T ₄)=2.99(G ₂₃)/(G ₃₄ +G ₄₅)=1.21(T _(a1) +G _(aa))/(T ₂ +T ₄)=5.42(G ₂₃ +G ₃₄)/(G ₁₂ +G ₄₅)=7.02(T ₁ +T ₅)/(T ₄)=3.52(T ₂)/(G ₁₂ +G ₄₅)=1.94T ₃ /T ₂=2.03(T ₁ +T ₃)/T ₂=5.09(T ₁ +T ₃ +T ₅)/T₄=4.57(G ₂₃)/(G ₁₂ +G ₄₅)=4.08(T _(a1) +G _(aa))/(T ₂ +G ₄₅)=12.98

SECOND EXAMPLE

Please refer to FIG. 3 which illustrates the second example of theoptical imaging lens set 1 of the present invention. Please refer toFIG. 4A for the longitudinal spherical aberration on the image plane 71of the second example; please refer to FIG. 4B for the astigmaticaberration on the sagittal direction; please refer to FIG. 4C for theastigmatic aberration on the tangential direction, and please refer toFIG. 4D for the distortion aberration. The second example is similarwith the first example with different optical data. The optical data ofthe second example of the optical imaging lens set are shown in FIG. 20while the aspheric surface data are shown in FIG. 21. The length of theoptical imaging lens set is 5.15 mm. The image height is 3.085 mm. Someimportant ratios of the second example are as follows:(T _(a1) +G _(aa))/(T ₃ +T ₅)=2.44T _(a1) /T ₃=4.51(T ₁ +T ₃ +T ₅)/(T ₂)=11.09(T ₃ +T ₅)/(T ₄)=4.06(G ₂₃)/(G ₃₄ +G ₄₅)=1.21(T _(a1) +G _(aa))/(T ₂ +T ₄)=6.46(G ₂₃ +G ₃₄)/(G ₁₂ +G ₄₅)=5.19(T ₁ +T ₅)/(T ₄)=4.25(T ₂)/(G ₁₂ +G ₄₅)=1.34T ₃ /T ₂=3.10(T ₁ +T ₃)/T ₂=6.56(T ₁ +T ₃ +T ₅)/T ₄=5.90(G ₂₃)/(G ₁₂ +G ₄₅)=3.10(T _(a1) +G _(aa))/(T ₂ +G ₄₅)=13.66

THIRD EXAMPLE

Please refer to FIG. 5 which illustrates the third example of theoptical imaging lens set 1 of the present invention. Please refer toFIG. 6A for the longitudinal spherical aberration on the image plane 71of the second example; please refer to FIG. 6B for the astigmaticaberration on the sagittal direction; please refer to FIG. 6C for theastigmatic aberration on the tangential direction, and please refer toFIG. 6D for the distortion aberration. The third example is similar withthe first example with different optical data. The optical data of thethird example of the optical imaging lens set are shown in FIG. 22 whilethe aspheric surface data are shown in FIG. 23. The length of theoptical imaging lens set is 5.15 mm. The image height is 3.185 mm. Someimportant ratios of the third example are as follows:(T _(a1) +G _(aa))/(T ₃ +T ₅)=2.66T _(a1) /T ₃=4.05(T ₁ +T ₃ +T ₅)/(T ₂)=8.22(T ₃ +T ₅)/(T ₄)=3.79(G ₂₃)/(G ₃₄ +G ₄₅)=1.21(T _(a1) +G _(aa))/(T ₂ +T ₄)=6.01(G ₂₃ +G ₃₄)/(G ₁₂ +G ₄₅)=5.93(T ₁ +T ₅)/(T ₄)=3.76(T ₂)/(G ₁₂ +G ₄₅)=1.64T ₃ /T ₂=2.64(T ₁ +T ₃)/T ₂=5.25(T ₁ +T ₃ +T ₅)/T ₄=5.55(G ₂₃)/(G ₁₂ +G ₄₅)=3.43(T _(a1) +G _(aa))/(T ₂ +G ₄₅)=12.30

FOURTH EXAMPLE

Please refer to FIG. 7 which illustrates the fourth example of theoptical imaging lens set 1 of the present invention. Please refer toFIG. 8A for the longitudinal spherical aberration on the image plane 71of the second example; please refer to FIG. 8B for the astigmaticaberration on the sagittal direction; please refer to FIG. 8C for theastigmatic aberration on the tangential direction, and please refer toFIG. 8D for the distortion aberration. The fourth example is similarwith the first example with different optical data except that the thirdobject-side surface 31 of the third lens element 30 is a concave surfacewith a concave part 34 (concave circular periphery part) in a vicinityof its circular periphery, and the fifth image-side surface 52 has aconcave part 56 (concave optical axis part) in the vicinity of theoptical axis and a concave part 59 (concave circular periphery part) ina vicinity of its circular periphery as well as a convex part 58 betweenthe optical axis and the circular periphery. The optical data of thefourth example of the optical imaging lens set are shown in FIG. 24while the aspheric surface data are shown in FIG. 25. The length of theoptical imaging lens set is 5.23 mm. The image height is 2.976 mm. Someimportant ratios of the fourth example are as follows:(T _(a1) +G _(aa))/(T ₃ +T ₅)=3.32T _(a1) /T ₃=4.20(T ₁ +T ₃ +T ₅)/(T ₂)=6.31(T ₃ +T ₅)/(T ₄)=3.02(G ₂₃)/(G ₃₄ +G ₄₅)=1.65(T _(a1) +G _(aa))/(T ₂ +T ₄)=5.57(G ₂₃ +G ₃₄)/(G ₁₂ +G ₄₅)=4.75(T ₁ +T ₅)/(T ₄)=3.41(T ₂)/(G ₁₂ +G ₄₅)=1.44T ₃ /T ₂=2.04(T ₁ +T ₃)/T ₂=4.57(T ₁ +T ₃ +T ₅)/T ₄=5.04(G ₂₃)/(G ₁₂ +G ₄₅)=3.35(T _(a1) +G _(aa))/(T ₂ +G ₄₅)=8.73

FIFTH EXAMPLE

Please refer to FIG. 9 which illustrates the fifth example of theoptical imaging lens set 1 of the present invention. Please refer toFIG. 10A for the longitudinal spherical aberration on the image plane 71of the second example; please refer to FIG. 10B for the astigmaticaberration on the sagittal direction; please refer to FIG. 10C for theastigmatic aberration on the tangential direction, and please refer toFIG. 10D for the distortion aberration. The fifth example is similarwith the first example with different optical data except that the firstimage-side surface 12 of the first lens element 10 is a convex surface,the second object-side surface 21 of the second lens element 20 is aconvex surface, and the third object-side surface 31 of the third lenselement 30 is a concave surface with a concave part 34 (concave circularperiphery part) in a vicinity of its circular periphery. The fifthimage-side surface 52 of the fifth lens element 50 has a concave part 56(concave optical axis part) in the vicinity of the optical axis and aconcave part 59 (concave circular periphery part) in a vicinity of itscircular periphery as well as a convex part 58 between the optical axisand the circular periphery. The optical data of the fifth example of theoptical imaging lens set are shown in FIG. 26 while the aspheric surfacedata are shown in FIG. 27. The length of the optical imaging lens set is5.13 mm. The image height is 2.968 mm. Some important ratios of thefifth example are as follows:(T _(a1) +G _(aa))/(T ₃ +T ₅)=3.78T _(a1) /T ₃=5.52(T ₁ +T ₃ +T ₅)/(T ₂)=8.26(T ₃ +T ₅)/(T ₄)=2.49(G ₂₃)/(G ₃₄ +G ₄₅)=1.28(T _(a1) +G _(aa))/(T ₂ +T ₄)=6.10(G ₂₃ +G ₃₄)/(G ₁₂ +G ₄₅)=7.30(T ₁ +T ₅)/(T ₄)=3.41(T ₂)/(G ₁₂ +G ₄₅)=1.34T ₃ /T ₂=2.01(T ₁ +T ₃)/T ₂=5.71(T ₁ +T ₃ +T ₅)/T ₄=4.51(G ₂₃)/(G ₁₂ +G ₄₅)=4.32(T _(a1) +G _(aa))/(T ₂ +G ₄₅)=13.23

SIXTH EXAMPLE

Please refer to FIG. 11 which illustrates the sixth example of theoptical imaging lens set 1 of the present invention. Please refer toFIG. 12A for the longitudinal spherical aberration on the image plane 71of the second example; please refer to FIG. 12B for the astigmaticaberration on the sagittal direction; please refer to FIG. 12C for theastigmatic aberration on the tangential direction, and please refer toFIG. 12D for the distortion aberration. The sixth example is similarwith the first example with different optical data except that the firstimage-side surface 12 of the first lens element 10 is a convex surface,the second object-side surface 21 of the second lens element 20 is aconvex surface, and the third object-side surface 31 of the third lenselement 30 is a concave surface with a concave part 34 (concave circularperiphery part) in a vicinity of its circular periphery. The fourthimage-side surface 42 of the fourth lens element 40 has a convex part 46(convex optical axis part) in the vicinity of the optical axis and aconvex part 47 (convex circular periphery part) in a vicinity of itscircular periphery as well as a concave part 48 between the optical axisand the circular periphery. The fifth image-side surface 52 of the fifthlens element 50 has a concave part 56 (concave optical axis part) in thevicinity of the optical axis and a concave part 59 (concave circularperiphery part) in a vicinity of its circular periphery as well as aconvex part 58 between the optical axis and the circular periphery. Theoptical data of the sixth example of the optical imaging lens set areshown in FIG. 28 while the aspheric surface data are shown in FIG. 29.The length of the optical imaging lens set is 5.14 mm. The image heightis 2.96 mm. Some important ratios of the sixth example are as follows:(T _(a1) +G _(aa))/(T ₃ +T ₅)=3.69T _(a1) /T ₃=5.52(T ₁ +T ₃ +T ₅)/(T ₂)=8.26(T ₃ +T ₅)/(T ₄)=2.49(G ₂₃)/(G ₃₄ +G ₄₅)=2.23(T _(a1) +G _(aa))/(T ₂ +T ₄)=5.95(G ₂₃ +G ₃₄)/(G ₁₂ +G ₄₅)=6.73(T ₁ +T ₅)/(T ₄)=3.41(T ₂)/(G ₁₂ +G ₄₅)=1.34T ₃ /T ₂=2.01(T ₁ +T ₃)/T ₂=5.71(T ₁ +T ₃ +T ₅)/T ₄=4.51(G ₂₃)/(G ₁₂ +G ₄₅)=5.12(T _(a1) +G _(aa))/(T ₂ +G ₄₅)=11.21

SEVENTH EXAMPLE

Please refer to FIG. 13 which illustrates the seventh example of theoptical imaging lens set 1 of the present invention. Please refer toFIG. 14A for the longitudinal spherical aberration on the image plane 71of the second example; please refer to FIG. 14B for the astigmaticaberration on the sagittal direction; please refer to FIG. 14C for theastigmatic aberration on the tangential direction, and please refer toFIG. 14D for the distortion aberration. The seventh example is similarwith the first example with different optical data except that the fifthobject-side surface 51 of the fifth lens element 50 has a concave part54′ (concave circular periphery part) in a vicinity of its circularperiphery. The optical data of the seventh example of the opticalimaging lens set are shown in FIG. 30 while the aspheric surface dataare shown in FIG. 31. The length of the optical imaging lens set is 5.15mm. The image height is 3.085 mm. Some important ratios of the sixthexample are as follows:(T _(a1) +G _(aa))/(T ₃ +T ₅)=3.11T _(a1) /T ₃=5.06(T ₁ +T ₃ +T ₅)/(T ₂)=7.74(T ₃ +T ₅)/(T ₄)=2.50(G ₂₃)/(G ₃₄ +G ₄₅)=1.20(T _(a1) +G _(aa))/(T ₂ +T ₄)=5.16(G ₂₃ +G ₃₄)/(G ₁₂ +G ₄₅)=3.53(T ₁ +T ₅)/(T ₄)=2.84(T ₂)/(G ₁₂ +G ₄₅)=0.98T ₃ /T ₂=2.12(T ₁ +T ₃)/T ₂=4.92(T ₁ +T ₃ +T ₅)/T ₄=3.92(G ₂₃)/(G ₁₂ +G ₄₅)=2.32(T _(a1) +G _(aa))/(T ₂ +G ₄₅)=8.88

Some important ratios in each example are shown in FIG. 32.

In the light of the above examples, the inventors observe the followingfeatures:

-   1) The aperture stop which is placed in front of the first lens    element and the positive refractive power of the first lens element    enhance the optical concentration of the entire optical imaging lens    set of five lens elements of the present invention to effectively    shorten the system length of the imaging lens set. Also, the    positive refractive power of the third lens element relieves the    burden of the positive refractive power of the first lens element to    reduce the fabricating sensitivity of the imaging lens set.-   2) The second image-side surface of the second lens element, the    third object-side surface of the third lens element, fourth    object-side surface of the fourth lens element with a concave part    in its circular periphery and the third image-side surface of the    third lens element with a convex part in its circular periphery work    together to minimize the aberrations and to ensure the imaging    quality of the fringe parts.-   3) The third image-side surface has a convex optical axis part, the    fourth object-side surface has a concave optical axis part, and the    fifth image-side surface has a concave optical axis part. They may    work together to assist in eliminating the aberrations. It is even    better when the first image-side surface has a concave optical axis    part.

In addition, the inventors discover that there are some better ratioranges for different data according to the above various importantratios. Better ratio ranges help the designers to design the betteroptical performance and an effectively reduced length of a practicallypossible optical imaging lens set. For example:

-   1. (T_(a1)+G_(aa))/(T₃+T₅) should be not greater than 4.0. When    T_(a1) and G_(aa) are smaller, the total length of the optical    imaging lens set is shorter. However, because the third lens element    has positive refractive power and the optical effective radius of    the fifth lens element is greater, they are not easy to be smaller.    This relationship helps T_(a1), G_(aa), T₃, and T₅, have a better    range. It is suggested that (T_(a1)+G_(aa))/(T₃+T₅) is 1˜4.-   2. T_(a1)/T₃ should be not greater than 5.8. T_(a1) is the total    thickness of all the lens elements in the optical imaging lens set    along the optical axis and a smaller one efficiently helps reduce    the size of the optical imaging lens set. However, because the third    lens element has positive refractive power, it is harder to be    relatively smaller. This relationship helps T_(a1) and T₃ have a    better range to have a shorter total length. It is suggested that    the range may be 2˜5.8.-   3. (T₁+T₃+T₅)/(T₂) should be not less than 5.6. Because both the    first and the third lens element have positive refractive power and    the optical effective radius of the fifth lens element is greater,    the second lens element may be relatively thinner than the first,    the third and the fifth lens element. This relationship provides a    better arrangement. It is suggested that the range may be 5.6˜13.-   4. (T₃+T₅)/(T₄) should be not less than 2.45. Because the third lens    element has positive refractive power and the optical effective    radius of the fifth lens element is greater, the fourth lens element    may be relatively thinner than the third and the fifth lens element.    It is suggested that the range may be 2.45˜5.5.-   5. (G₂₃)/(G₃₄+G₄₅) should be not less than 1.2. Because the second    image-side surface has a concave circular periphery part, a    sufficient air gap is needed to allow the light entering the next    lens element at a suitable location to ensure the imaging quality so    G₂₃ is less shrinkable than G₃₄ or G₄₅. This relationship proposes a    better arrangement of a shorter optical imaging lens set. It is    suggested that the range may be 1.20˜3.00.-   6. (T_(a1)+G_(aa))/(T₂+T₄) should be not less than 5.00. Because    both the first and the third lens element have positive refractive    power and the optical effective radius of the fifth lens element is    the greatest, the three lens elements are thicker and harder to get    relatively thinner. When the optical imaging lens set gets shorter,    T₂ and T₄ are less limited to be smaller and may become relatively    thinner. When the fabrication is taken into consideration, G_(aa)    are therefore restricted. This relationship proposes a better    arrangement of T_(a1), G_(aa), T₂, and T₄ for a shorter optical    imaging lens set. It is suggested that the range may be 5.00˜7.00.-   7. (G₂₃+G₃₄)/(G₁₂+G₄₅) should be not less than 3.30. When the light    path and the fabrication are taken into consideration, this    relationship proposes a better arrangement of air gaps of the lens    elements. It is suggested that the range may be 3.30˜9.00.-   8. (T₁+T₅)/(T₄) should be not less than 2.60. Because the first lens    element has positive refractive power and the optical effective    radius of the fifth lens element is greater, the first and the fifth    lens element may be relatively thicker than the fourth lens element.    This relationship proposes a better arrangement for a shorter    optical imaging lens set. It is suggested that the range may be    2.60˜6.00.-   9. (T₂)/(G₁₂+G₄₅) should be not less than 1.30. When the light path    and the fabrication are taken into consideration, this relationship    proposes a better arrangement for T₂, G₁₂ and G₄₅. It is suggested    that the range may be 1.30˜3.00.-   10. T₃/T₂ should be not less than 2.00. Because the third lens    element has positive refractive power and may be thicker than the    second lens element, this relationship proposes a better    arrangement. It is suggested that the range may be 2.00˜5.00.-   11. (T₁+T₃)/T₂ should be not less than 4.30. Because both the first    and the third lens element have positive refractive power and may be    thicker than the second lens element, this relationship proposes a    better arrangement. It is suggested that the range may be 4.30˜8.00.-   12. (T₁+T₃+T₅)/T₄ should be not less than 3.80. Because both the    first and the third lens element have positive refractive power and    the optical effective radius of the fifth lens element is greater,    they may be relatively thicker than the fourth lens element. This    relationship proposes a better arrangement. It is suggested that the    range may be 3.80˜7.00.-   13. (G₂₃)/(G₁₂+G₄₅) should be not less than 2.30. Because the second    image-side surface has a concave circular periphery part, a    sufficient air gap is needed to allow the light entering the next    lens element at a suitable location of to ensure the imaging quality    so G₂₃ is less shrinkable. This relationship proposes a better    arrangement. It is suggested that the range may be 2.30˜7.00.-   14. (T_(a1)+G_(aa))/(T₂+G₄₅) should be not less than 8.70. This    relationship makes T₂ and G₄₅ smaller. It is suggested that the    range may be 8.70˜15.00.

The optical imaging lens set 1 of the present invention may be appliedto a portable electronic device. Please refer to FIG. 16. FIG. 16illustrates a first preferred example of the optical imaging lens set 1of the present invention for use in a portable electronic device 100.The portable electronic device 100 includes a case 110, and an imagemodule 120 mounted in the case 110. A mobile phone is illustrated inFIG. 16 as an example, but the portable electronic device 100 is notlimited to a mobile phone.

As shown in FIG. 16, the image module 120 includes the optical imaginglens set 1 as described above. FIG. 16 illustrates the aforementionedfirst example of the optical imaging lens set 1. In addition, theportable electronic device 100 also contains a barrel 130 for theinstallation of the optical imaging lens set 1, a module housing unit140 for the installation of the barrel 130, a substrate 172 for theinstallation of the module housing unit 140 and an image sensor 70disposed at the substrate 172, and at the image side 3 of the opticalimaging lens set 1. The image sensor 70 in the optical imaging lens set1 may be an electronic photosensitive element, such as a charge coupleddevice or a complementary metal oxide semiconductor element. The imageplane 71 forms at the image sensor 70.

The image sensor 70 used here is a product of chip on board (COB)package rather than a product of the conventional chip scale package(CSP) so it is directly attached to the substrate 172, and protectiveglass is not needed in front of the image sensor 70 in the opticalimaging lens set 1, but the present invention is not limited to this.

To be noticed in particular, the optional filter 60 may be omitted inother examples although the optional filter 60 is present in thisexample. The case 110, the barrel 130, and/or the module housing unit140 may be a single element or consist of a plurality of elements, butthe present invention is not limited to this.

Each one of the five lens elements 10, 20, 30, 40 and 50 with refractivepower is installed in the barrel 130 with air gaps disposed between twoadjacent lens elements in an exemplary way. The module housing unit 140has a lens element housing 141, and an image sensor housing 146installed between the lens element housing 141 and the image sensor 70.However in other examples, the image sensor housing 146 is optional. Thebarrel 130 is installed coaxially along with the lens element housing141 along the axis I-I′, and the barrel 130 is provided inside of thelens element housing 141.

Because the optical imaging lens set 1 of the present invention may beas short as 5.15 mm, this ideal length allows the dimensions and thesize of the portable electronic device 100 to be smaller and lighter,but excellent optical performance and image quality are still possible.In such a way, the various examples of the present invention satisfy theneed for economic benefits of using less raw materials in addition tosatisfy the trend for a smaller and lighter product design andconsumers' demands.

Please also refer to FIG. 17 for another application of theaforementioned optical imaging lens set 1 in a portable electronicdevice 200 in the second preferred example. The main differences betweenthe portable electronic device 200 in the second preferred example andthe portable electronic device 100 in the first preferred example are:the lens element housing 141 has a first seat element 142, a second seatelement 143, a coil 144 and a magnetic component 145. The first seatelement 142 is for the installation of the barrel 130, exteriorlyattached to the barrel 130 and disposed along the axis I-I′. The secondseat element 143 is disposed along the axis I-I′ and surrounds theexterior of the first seat element 142. The coil 144 is provided betweenthe outside of the first seat element 142 and the inside of the secondseat element 143. The magnetic component 145 is disposed between theoutside of the coil 144 and the inside of the second seat element 143.

The first seat element 142 may pull the barrel 130 and the opticalimaging lens set 1 which is disposed inside of the barrel 130 to movealong the axis I-I′, namely the optical axis 4 in FIG. 1. The imagesensor housing 146 is attached to the second seat element 143. Thefilter 60, such as an infrared filter, is installed at the image sensorhousing 146. Other details of the portable electronic device 200 in thesecond preferred example are similar to those of the portable electronicdevice 100 in the first preferred example so they are not elaboratedagain.

Those skilled in the art will readily observe that numerousmodifications and alterations of the device and method may be made whileretaining the teachings of the invention. Accordingly, the abovedisclosure should be construed as limited only by the metes and boundsof the appended claims.

What is claimed is:
 1. An optical imaging lens set, from an object sidetoward an image side in order along an optical axis comprising: anaperture stop; a first lens element with positive refractive power; asecond lens element having a second image-side surface facing towardsaid image side and said second image-side surface having a concaveportion in a vicinity of a circular periphery of said second lenselement; a third lens element with positive refractive power, having aconvex third image-side surface facing toward said image side and athird object-side surface facing toward said object side, and said thirdobject-side surface having a concave portion in a vicinity of a circularperiphery of said third lens element; a fourth lens element having aconcave fourth object-side surface facing toward said object side; and aplastic fifth lens element having a fifth image-side surface facingtoward said image side and said fifth image-side surface having aconcave portion in a vicinity of said optical axis, wherein said opticalimaging lens set exclusively has five lens elements with refractivepower, and a total thickness Ta1 of said first lens element, said secondlens element, said third lens element, said fourth lens element and saidfifth lens element along said optical axis, all four air gaps Gaabetween each lens element from said first lens element to said fifthlens element along the optical axis, the thickness T₃ of said third lenselement along said optical axis and the thickness T₅ of the fifth lenselement along the optical axis satisfy the relation(Ta1+Gaa)/(T₃+T₅)≦4.00 and an air gap G₂₃ between said second lenselement and said third lens element along said optical axis, an air gapG₃₄ between said third lens element and said fourth lens element alongsaid optical axis, and an air gap G₄₅ between said fourth lens elementand said fifth lens element along said optical axis satisfy arelationship 1.20≦(G₂₃)/(G₃₄+G₄₅).
 2. The optical imaging lens set ofclaim 1, wherein Ta1/T₃≦5.80.
 3. The optical imaging lens set of claim2, wherein a thickness T₁ of said first lens element along said opticalaxis and a thickness T₂ of said second lens element along said opticalaxis satisfy a relationship 5.60≦(T₁+T₃+T₅)/(T₂).
 4. The optical imaginglens set of claim 3, wherein a thickness T₄ of said fourth lens elementalong said optical axis satisfies a relationship 2.45≦(T₃+T₅)/(T₄). 5.The optical imaging lens set of claim 4, wherein an air gap G₄₅ betweensaid fourth lens element and said fifth lens element along said opticalaxis satisfies a relationship 8.70≦(Ta1+Gaa)/(T₂+G₄₅).
 6. The opticalimaging lens set of claim 2, wherein a thickness T₂ of said second lenselement along said optical axis and a thickness T₄ of said fourth lenselement along said optical axis satisfy a relationship5.00≦(Ta1+Gaa)/(T₂+T₄).
 7. The optical imaging lens set of claim 6,wherein an air gap G₁₂ between said first lens element and said secondlens element along said optical axis satisfies a relationship3.30≦(G₂₃+G₃₄)/(G₁₂+G₄₅).
 8. The optical imaging lens set of claim 1,wherein a thickness T₁ of said first lens element along said opticalaxis and a thickness T₂ of said second lens element along said opticalaxis satisfy a relationship 5.60≦(T₁+T₃+T₅)/(T₂).
 9. The optical imaginglens set of claim 8, wherein a thickness T₄ of said fourth lens elementalong said optical axis satisfies a relationship 2.60≦(T₁+T₅)/(T₄). 10.The optical imaging lens set of claim 9, wherein an air gap G₁₂ betweensaid first lens element and said second lens element along said opticalaxis satisfies a relationship 1.30≦(T₂)/(G₁₂+G₄₅).
 11. The opticalimaging lens set of claim 10, wherein 2.00≦T₃/T₂.
 12. The opticalimaging lens set of claim 8, wherein 4.30≦(T₁+T₃)/T₂.
 13. The opticalimaging lens set of claim 12, wherein said first lens element furtherhas a first image-side surface facing toward said image side and saidfirst image-side surface has a concave part in a vicinity of saidoptical axis and satisfies 3.80≦(T₁+T₃+T₅)/T₄.
 14. The optical imaginglens set of claim 1, wherein a thickness T₂ of said second lens elementalong said optical axis and a thickness T₄ of said fourth lens elementalong said optical axis satisfy a relationship 5.00≦(Ta1+Gaa)/(T₂+T₄).15. The optical imaging lens set of claim 14, wherein an air gap G₁₂between said first lens element and said second lens element along saidoptical axis satisfies a relationship 2.30≦(G₂₃)/(G₁₂+G₄₅).
 16. Theoptical imaging lens set of claim 15, wherein 8.70≦(Ta1+Gaa)/(T₂+G₄₅).17. An electronic device, comprising: a case; and an image moduledisposed in said case and comprising: an optical imaging lens set ofclaim 1; a barrel for the installation of said optical imaging lens set;a module housing unit for the installation of said barrel; and an imagesensor disposed at an image side of said optical imaging lens set. 18.The electronic device of claim 17, wherein said module housing unit hasa lens element housing with a first seat element exteriorly attached tosaid barrel and disposed along an axis as well as a second seat elementdisposed along said axis and exteriorly surrounding said first seatelement so that said first seat element, said barrel, and said opticalimaging lens set are capable of moving together to control said opticalimaging lens set along said optical axis.
 19. The electronic device ofclaim 18, wherein said module housing unit comprises an image sensorhousing disposed between said lens element housing and said imagesensor, and said image sensor housing is attached to said second seatelement.